Cancelo mate.
I think the plan for next season is/was to play Cancelo more often at RB and to use the new FB at LB. Now, if we keep Zinch, we may change the plan. Cancelo stays our main LB and we are a bit light at RB.
I'd be happy to have Walker, Cancelo and Cucu as our main FB options, plus Stones at RB and Ake at LB as 3rd choice. But if we don't sell Zinch, then a quality new FB may be needed indeed. He will cost over 20m. We have to decide whether it's better to sell Zinch for 30m and buy Cucu for 50m, or it's better to keep Zinch and invest 30-40m in a new FB, who may not be as good as Cucu, though...